Disclosed is a connection device for piezoceramics of an ultrasonic transducer, comprising a nut (1), an ultrasonic transducer (5) having a screw structure and to be used with the nut (1), and a plurality of piezoceramics (3) and a plurality of metal sheets (4) fitted on an outer circumference of the screw of the ultrasonic transducer (5) and arranged at intervals. The connection device for the piezoceramics of the ultrasonic transducer further comprises a washer (2) located between the nut (1) and the piezoceramics (3), and the washer (2) is provided with a through hole through which the screw passes. The connection device has high connecting precision, strong working stability, and high working reliability.